What is true of valence electrons? a) they exist in the outer orbital. b) they easily move from one orbital to another c) they have difficulty moving from one orbital to another d) they are always the lowest energy electrons of the atom

The difference between atomic mass and molar mass

What method(s) do plants use to obtain nitrogen? select all that apply. absorb it from the atmosphere use bacteria to convert nitrogen to usable form obtain usable nitrogen compounds from the soil absorb nitrogen from water taken in at the roots

Name the element in group 17, period 2. (periodic table)